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    <h1>TODO list</h1>    
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<h3>Lex and Yacc part</h3>
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<li>add <code>char</code> type, and add support for C style char and string literal
<li>add <code>enum</code> type
<li>add function prototype, so as to call C library functions
<li>add scope variables, so as to define variables locally
<li>Lab 2: lexer
<li>Lab 3: parser
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<h3>Ast part</h3>
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<li>modify ast design to accompany language modification
<li>Lab 4: ast
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<h3>more ...</h3>
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<li>...
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